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Overclocking Pentium Dual-Core

post #1 of 34
Thread Starter 
I have an Intel Pentium Dual-Core E5800 (Wolfdale core).
http://ark.intel.com/Product.aspx?id=42802

At stock settings:
- 800 MHz FSB
- x16 multiplier
- 3.2 GHz clock speed
- 1.25 V

My current overclock:
- 960 MHz FSB
- x16 multiplier
- 3.86 GHz clock speed
- 1.4 V

Anyone have any tips or suggestions on how far I can push this chip? Other models with the same architecture are the E5200, E5300, E5400, E5500, E5700 and the non-existant E5900. They all have Wolfdale cores.

Specifically, how high should I increase the voltage on this chip? The rated maximum is 1.3625 V, according to Intel. I don't want to overvolt it and blow it out. At 1.4 V, I can't get it to 4 GHz.

Thanks for the tips!
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post #2 of 34
Most people run them every day at 1.5+, I don't recommend going over 1.6v, your biggest factor is going to be heat, so make sure to have a good cooler and you should be fine smile.gif I had an E3400 (wolfdale core) and it did 4.2ghz @ 1.5v and probably could have done higher had I wanted to really push it.
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post #3 of 34
1.5V is high for a 45nm Wolfdale, especially a dual core, for every day use. I'd stay below 1.4V maximum.
Quote:
Originally Posted by Rifdhan;14192787 
My current overclock:
- 960 MHz FSB
- x16 multiplier
- 3.86 GHz clock speed
- 1.4 V
Something's wrong here. A multiplier of 16 with a FSB of 960MHz (480MHz) should get you like 7.68GHz. It sounds like your multiplier is really 8. Can you raise it to 9 and drop the FSB to 450MHz? What about 10 x 400MHz?
post #4 of 34
Thread Starter 
When I say 960 FSB, that means 240 x 4 as my FSB is quadraphonic. So it's actually 240 x 16 = 3.86 GHz. Sorry for the confusion.

Then for the voltage:
I was also going to try 1.5 V (or somewhere around 1.45 V first), but I wanted a second opinion.
I think 1.4 is not high at all! It's barely a bit higher than the official max: 1.3625 V, and I'm sure it'll handle well over that.

Thanks for the replies!
Edited by Rifdhan - 7/13/11 at 4:57am
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post #5 of 34
Quote:
Originally Posted by Rifdhan;14199108 
When I say 960 FSB, that means 240 x 4 as my FSB is quadraphonic. So it's actually 240 x 16 = 3.86 GHz. Sorry for the confusion.

Then for the voltage:
I was also going to try 1.5 V (or somewhere around 1.45 V first), but I wanted a second opinion.
I think 1.4 is not high at all! It's barely a bit higher than the official max: 1.3625 V, and I'm sure it'll handle well over that.

Thanks for the replies!
1.45v and more is nice for Conroe CPU's (65nm), not Wolfdales (45nm). The smaller the transistors the less voltage they will tolerate.

You could try 1.425v and even 1.45v to reach 4 GHz. As appleg33k85 has said, your biggest problem is going to be heat, even tho Wolfdales run a lot cooler than Conroes.

I'd try getting to 250-260 MHz FSB once you do a slight voltage bump.
   
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post #6 of 34
Thread Starter 
OK now here's a wierd problem:

- If I set VCore to 1.3875 V in BIOS, CPU-Z says it's 1.248 V
- If I set VCore to 1.4000 V, CPU-Z still says it's 1.248 V!

I have:
- Disabled C1E and C2E halt states
- Disabled Intel SpeedStep
- Tried running demanding applications (GTA IV)

The max CPU-Z ever reports is 1.248 V!

Could CPU-Z be wrong? What can I trust to be true?
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post #7 of 34
i used to run - 11.5 x 320 @ 1.3125 for 3.7 ghz i think.
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post #8 of 34
Quote:
Originally Posted by Rifdhan;14199513 
Could CPU-Z be wrong? What can I trust to be true?
Yes, CPU-Z can be wrong. No software can accurately provide you a reading on any voltage. For that, you need to test voltage yourself (if your mobo has voltage reading points) or just trust the BIOS settigs.
   
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post #9 of 34
Thread Starter 
OK, well I found a wierd solution:

Use EasyTune6 (the OC software that came with this mobo) to set the VCore after boot.

- Set VCore to 1.4 V in BIOS, CPU-Z reports 1.248 V
- Set VCore to 1.4 V in EasyTune6, CPU-Z now reports 1.36 V!

Wierd huh? I wonder why the voltage can only be adjusted after boot-up.

Anyhow, I just OC'd the FSB to 250 MHz, and I'm running at 4 GHz! Finally!
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post #10 of 34
Quote:
Originally Posted by Rifdhan;14199108 
When I say 960 FSB, that means 240 x 4 as my FSB is quadraphonic. So it's actually 240 x 16 = 3.86 GHz. Sorry for the confusion.
I'm aware of the FSB being quad pumped, but I assumed 960MHz meant 480MHz (and that it was effectively 1920MHz). I didn't think you were actually working with such a low FSB. I see now.

In any case, my advice is the same... raise the FSB and try a lower multiplier. At any given speed, a higher FSB is usually better for performance. I think higher multipliers might incur a slight need for more voltage as well (?). I'm not sure how high that chipset goes, but it's rated for 1333MHz (333MHz) at least, so try a nice 333MHz FSB x 12 multiplier maybe? That'll get you about (4MHz shy of) 4GHz.

As for voltage, 1.4V is usually what most recommend for the 45nm chips. Heck, I'm so used to mine being in the middle of the 1.2x range for so long that even 1.4V sounds high to me. No way I'd give it 1.5V and expect it to last too long without degradation, but it might not be fast enough to matter before it's replaced. Who knows?
Quote:
Originally Posted by Rifdhan;14199563 
OK, well I found a wierd solution:

Use EasyTune6 (the OC software that came with this mobo) to set the VCore after boot.

- Set VCore to 1.4 V in BIOS, CPU-Z reports 1.248 V
- Set VCore to 1.4 V in EasyTune6, CPU-Z now reports 1.36 V!

Wierd huh?
It's simple, it's vdrop and/or vdroop (although what is unusual is how much your board has!).

Don't do it with software. If setting 1.4V in the BIOS results in 1.248V in actuality (hey, that's a familiar value, it's what I need for 4.0GHz), then set it higher to compensate. That's a massive ~0.15V difference you're seeing from vdrop though. I think mine is like ~0.038V lower than what I set it to at most.

I'd also still try for a setup with a lower multiplier and higher FSB for better performance. The CPU does 4GHz, and the chipset does 1333MHz, so you should be able to get at least a 333 x 12 setup going.
Edited by Princess Garnet - 7/13/11 at 11:25am
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